Oil filter assembly



Z,l l' R. D. Hlm. 2,294,181

OIL 'FILTER ASSEMBLY lfiled Nov. 15, 1958 Patented Aug. 25, 1942 UNITED STATES OIL FILTER ASSEMBLY Rolo D. Hill, Los Angeles, Calif., assigner of onohalf to Guy S. Tucker, Los Angeles, Calif.

ATENT OFFICE My invention relates to an oil filter assembly, and as to certain aspects may be considered a further development or an improvement on the oil filter of my patent application Serial No.

somewhat of a cone type of spreader as ,defined in my patent application above mentioned, together with an absorbent pad under which the thin film of oil flows. However, I make provision 152,123, filed July 5, 1937, which matured into to prevent the direct contact of the oil with the Patent No. 2,145,304, issued January 31, 1939. absorbent pad.

A characteristic of my present invention is that My invention is illustrated in connection with in the filter device proper I use preferably a cythe accompanying drawing in which, for sake lindrical filter block having a central opening. of convenience, in Fig. 1 the iilter assembly and The ow of oil in the ltration is from the pethe water absorbent assembly are illustrated conriphery toward the center of the block, that is, nected in a vertical axial plane, such plane being such central opening, the oil then being directed considered as on the line I-l of Fig. 2 as to the by an upward flow to an outlet connected by suitlter assembly, and l-i of Fig. 3 as to the oil able piping back to an engine crankcase, or the absorbent assembly. like. This type of oil filter assembly is designed Fig. 2 is a horizontal section on the line 2-2 to filter a portion of the total oil flow developed of Fig. 1 in the direction of the arrows. by a mechanical oil pump such as used on in- Fig, 3 is a section on the line 3 3 of Fig. 1 in ternal combustion engines of the automobile type the direction of the arrows. whereby, should the filter become obstructed, Dealing rst with the filter assembly desigthere would still be a iiow of oil under pressure to nate-d l l, this includes a case or housing l 2 which various parts of the engine. has a cylindrical side wall I3 and an inverted My present invention simplifies the manner of cone-shaped bottom lil with a substantial lug l5 mounting the lter on an engine block or in close at the apex of the bottom. This lug has a proximity thereto, and secures a tight clamping threaded recess or socket I6 on the outside and a of the cover or head to the enclosing casing second threaded recess l'l on the inside. The which contains the lter block and also a space cylinder has an upper edge transverse to its axis. for the accumulation 0f sediment, 'I'he cap 29 is a substantial block having prefer- Therefore, an object and feature of the case ably a plane under surface and is secured to the or housing construction includes a housing or casing by a bolt 2| passing through an opening casing with a cylindrical side wall and preferably in the cap and having a lower threaded end 22 a cone base7 this being provided with a substanthreaded in the recess Il. This bolt is operated tial lug at the inverted apex, such lug having a by a hand grip wrench 23 and has a gasket 24 to threaded socket so that it may be attached diprevent leakage. There is a packing gasket 25 rectly to a stud screw or the like on the top of engaging the lower surface of the cap and the an engine block and thus the whole assembly upper edge of the peripheral wall I3, this being mounted directly on the block of the engine or confined by a downwardly extending flange 26. a suitable support adjacent thereto. The cover This construction forms a simple assembly for is clamped to the case forming an oil tighti seal the cap and the casing and a simple manner of by means of a bolt extending downwardly mounting the lter on an engine or the like as through the center of the cap being provided 40 the socket i6 may be threaded on a stud or the with a hand gripy wrench device at the top, the equivalent on an engine block. lower end of the bolt being threaded Vand engag- The lter block designated by the numeral 30 ing upwardly extending threaded socket in the lug is preferably of a composition as defined in my at the bottom of the case. Suitable gaskets bepatent application entitled Oil filter block corntween the rim of the cylindrical side wall of the f5 position and method of making, led November case and the cap prevent leakage. Abottom plate 15, 1938, Serial No. 240,517, matured into Patent engaging the bolt pressing upwardly on the lter No. 2,145,304, issued January 31, 1939. This block restrains entrance of oil at the ends of the block has a cylindrical periphery 3i and also a block, thereby requiring a filtering action from cylindrical opening 32 between the ends. These the periphery towards the center, the cil supply ends are preferably transverse to the axis of the being directed to the space surrounding the peblock and the bolt 2! extends therethrough. 'Ihe riphery of the block. cap has a recess 33 aligning with an opening 34 My invention also includes an improved form in the washer 25 and both of these being in alignof moisture or water absorbent from oil by abment with the central opening 32 of the block. sorbing the water in the oil vapor. This employs There is thus an annular Space between the interior of the block and the bolt 2|. The block is held tightly clamped against the washer 25 by a clamping disc 35 which has an opening therethrough to receive the bolt 2| and a threaded packed recess 36 in which is threaded a plug 31 and this plug is forced upwardly by a nut 38 on the bolt end 22. It is preferable to use a ringlike gasket 39 on top of the clamping disc and such disc also preferably has a cone-shaped center lug 4).

The oil circulation is by means of an inflow pipe 45 which is connected by a nipple 45 to a recess 41 in the cap 28 and from this recess there is an oil duct 68 leading to the annular space 49 between the periphery of the block and the inside of the cylindrical walls I3 of the case. This directs the inilowing oil into this space from whence it flows radially through the filter block.

- The filtered cil has an outlet through the exhaust duct 58 which leads from the recess 33 preferably n radially to a nipple 55 whence it may lead back to the crankcase of the engine if the water absorbent device is not utilized.

The manner of operation of the lter so far described is substantially as follows: All of .the oil entering passes into the annular space 49 and as the only passage for such oil is through the lter block from the periphery towards the center the flow is directed along somewhat radial lines. There is, however, a large peripheral area exposed or adjacent the outside of the cylinder where the oil contains most of the dirt to be removed. As the portion of the block adjacent its periphery extracts the foreign matter from the oil, such oil becomes clear and hence has a more ready flow through the smaller area of the block adjacent its center. The space above the conical bottom I4 and below the clamping plate 35 is of utility in providing for the accumulation of sediment, this accumulating well below the area of the moving or circulating oil so that it is not stirred up or carried again up t the filter block. The circulating oil, after passing through the block, flows upwardly through the center of the block and outwardly through the duct 58.

The water absorbent device and assembly designated need not be directly connected to the cap as illustrated for the sake of convenience. It is usual to have this device mounted on the dash or instrument panel where it may be readily observed by the driver of an automobile. This includes a base 15 which has an annular rim 11 and inside of this a flat annular seat 18 on which is located a gasket 19. An inverted cup 88 and preferably formed of glass has its lower edge resting on the gasket. This glass has a recess 8| at the top and a center perforation 82. A bolt 83 is threaded tight to the base 16 as indicated at 84 and extends upwardly through the center perforation 82 in the glass and has a finger grip knob 85 threaded thereon which compresses a packing -86 in the recess 8| in the top of the glass. The oil enters Vby an inlet duct 98 in the illustration, this being connected to nipple 55. It flows upwardly inside of a tube 9|, that is, in the annular space between this tube and the bolt 83. At the top of the pipe there is a frustum of a cone 92, the oil discharging over the upper edge 93, fiowing downwardly over the skirt portion 94, and dripping to the base 16 which has a shallow annular groove to receive the oil drip, to the outlet 95.

The moisture absorbent material |88 is illustrated as constructed of two pads 10| and |02 packed in the upper end of the inverted glass cup and held in place by a metal disk |83 which is conical on its upper surface and is secured to the bolt 83 by soldering or by providing a threaded connection. The construction leaves a space between the skirt S4 of the cone 92 and the disk |03 which supports the absorbent pads.

As the oil flowing through the absorbent device is hot, the water vapor separates from the oil as it spreads over the skirt 94, such oil flowing upwardly in the annular space between the tube 9| and the bolt 83 as above mentioned. The disk |03 prevents the direct contact of the oil with the lower pad so that such pad is only subject to the water vapors in the oil and such vapors become absorbed thus extracting water mostly of contamination from the oil. When the pads become saturated the inverted cup may readily be removed and replacement pads inserted. These pads also absorb a small amount of the oil vapor but their main function is to absorb the water vapor.

Where it is inconvenient or impractical to support the filter by attaching through the medium of the socket I8 to a stud or the like on the engine or a fixed supporting structure, the filter may be suspended by the cap 23 which is provided with two or more threaded recesses in its peripheral edge, these not being shown in the drawing.

Various changes may be made in the details of the construction without departing from the spirit or scope of the invention as defined by the appended claim.

I claim:

In an oil filter assembly, a moisture absorbent device including a base having an inlet duct, an inverted cup mounted on the base of the absorbent device, a bolt secured to said latter base and extending upwardly, there being a top opening in the inverted cup, a tube secured to the latter base and extending upwardly and surrounding the bolt provided with an oil spreading structure having a cone shaped skirt, a disk secured to the bolt, an absorbent pad between the disk and the upper end of the cup and a nut connected to the upper end of the bolt and forming a clamping means with the top of the inverted cup, the base of the absorbent device having means to collect the drip of oil and an outlet in said base for the oil drip.

ROLO D. HILL. 

